JPH11199317A - Refractory for furnace wall and melting furnace using the same - Google Patents
Refractory for furnace wall and melting furnace using the sameInfo
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- JPH11199317A JPH11199317A JP10003560A JP356098A JPH11199317A JP H11199317 A JPH11199317 A JP H11199317A JP 10003560 A JP10003560 A JP 10003560A JP 356098 A JP356098 A JP 356098A JP H11199317 A JPH11199317 A JP H11199317A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、焼却灰、産業廃棄
物などを溶融する溶融炉の炉壁などに使用される耐火物
およびこの耐火物を使用した溶融炉に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory used for a furnace wall of a melting furnace for melting incineration ash, industrial waste, and the like, and a melting furnace using the refractory.
【０００２】[0002]
【従来の技術】従来、ごみ焼却灰、産業廃棄物などを溶
融し減容化を図るための溶融炉における炉壁の構成材
料、すなわち炉壁用耐火物としては、酸化アルミニウム
（Ａｌ2Ｏ3）を主成分とし、耐食性を発揮させる酸化ク
ロム（Ｃｒ2Ｏ3）が５〜２０重量％の範囲で添加された
組成のものが使用されているが、特に損傷が激しい部
位、例えばスラグライン近傍には、耐食性を高めるため
に、酸化クロム（Ｃｒ2Ｏ3）が３０〜５０重量％含有さ
れたものが使用されている。2. Description of the Related Art Conventionally, as a constituent material of a furnace wall in a melting furnace for melting refuse incineration ash and industrial waste to reduce the volume, that is, as a refractory for the furnace wall, aluminum oxide (Al 2 O 3) is used. ) as a main component, but chromium oxide to exhibit corrosion resistance (Cr 2 O 3) is those compositions which are added in a range of 5 to 20% by weight are used, in particular has been severely damaged site, e.g., near the slag line the, in order to increase the corrosion resistance, chromium oxide (Cr 2 O 3) those are contained 30 to 50 wt% is used.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の耐火物、特
に損傷の激しい部位に使用されるものについては、酸化
クロムが多量に含有されているため、六価クロムの発生
が多くなるという問題がある。The above-mentioned conventional refractories, particularly those used for severely damaged parts, contain a large amount of chromium oxide, and therefore have a problem that the generation of hexavalent chromium increases. is there.
【０００４】そこで、本発明は、酸化クロムの含有量を
増加させなくても、耐食性を向上させ得る炉壁用耐火物
およびこの耐火物を使用した溶融炉を提供することを目
的とする。Accordingly, an object of the present invention is to provide a refractory for a furnace wall capable of improving corrosion resistance without increasing the content of chromium oxide, and a melting furnace using the refractory.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明の炉壁用耐火物は、酸化アルミニウム（Ａｌ
2Ｏ3）を主成分とする炉壁用耐火物であって、酸化クロ
ム（Ｃｒ2Ｏ3）の含有量が５〜２０重量％、酸化マグネ
シウム（ＭｇＯ）の含有量が７〜３５重量％および酸化
ジルコニウム（ＺｒＯ2）の含有量が７〜３５重量％の
範囲としたものであり、また上記耐火物において、酸化
マグネシウム（ＭｇＯ）の替わりに、スピネル（ＭｇＡ
ｌ2Ｏ4）を３０〜６０重量％の範囲で含有させたもので
ある。In order to solve the above-mentioned problems, a refractory for a furnace wall according to the present invention comprises aluminum oxide (Al).
2 O 3 ) as a main component for a furnace wall, wherein the content of chromium oxide (Cr 2 O 3 ) is 5 to 20% by weight and the content of magnesium oxide (MgO) is 7 to 35% by weight. And the content of zirconium oxide (ZrO 2 ) is in the range of 7 to 35% by weight. In the refractory, spinel (MgA) is used instead of magnesium oxide (MgO).
l 2 O 4 ) in the range of 30 to 60% by weight.
【０００６】上記の各耐火物によると、酸化クロムの含
有量が５〜２０重量％と低くくても、その含有量が３０
〜５０重量％である耐火物と同等以上の耐食性を発揮さ
せることができる。According to each of the above refractories, even if the content of chromium oxide is as low as 5 to 20% by weight, the content is 30%.
Corrosion resistance equal to or higher than that of a refractory of up to 50% by weight can be exhibited.
【０００７】また、本発明の溶融炉は、上記の各炉壁用
耐火物を、被溶融物を溶融するための溶融炉における炉
本体のスラグライン近傍の内壁面に配置したものであ
り、これによると、耐食性に優れた溶融炉の提供が可能
となる。Further, in the melting furnace of the present invention, the above-mentioned refractories for furnace walls are arranged on an inner wall surface near a slag line of a furnace body in a melting furnace for melting a material to be melted. According to this, it is possible to provide a melting furnace having excellent corrosion resistance.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態におけ
る炉壁用耐火物および溶融炉について説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a refractory for a furnace wall and a melting furnace according to an embodiment of the present invention will be described.
【０００９】まず、本実施の形態に係る炉壁用耐火物
は、酸化アルミニウム（Ａｌ2Ｏ3）を主成分とする耐火
物に、酸化クロム（Ｃｒ2Ｏ3）を５〜２０重量％、酸化
マグネシウム（ＭｇＯ）を７〜３５重量％および酸化ジ
ルコニウム（ＺｒＯ2）を７〜３５重量％の割合でそれ
ぞれ含有させたものであり、好ましい含有量は、酸化マ
グネシウムが１０〜３０重量％および酸化ジルコニウム
が１０〜３０重量％の範囲であり、また他の実施の形態
における炉壁用耐火物としては、上記耐火物における酸
化マグネシウムの替わりに、スピネル（ＭｇＡｌ2Ｏ4）
を３０〜６０重量％の範囲で含有させたものである。な
お、これらの耐火物を使用した焼却炉、溶融炉などにお
いては、好ましい（耐食性が発揮し得る）使用可能な被
溶融物（被処理物）の塩基度は０．５〜２の範囲内とさ
れる。First, a refractory for a furnace wall according to the present embodiment is a refractory containing aluminum oxide (Al 2 O 3 ) as a main component, with chromium oxide (Cr 2 O 3 ) being 5 to 20% by weight. magnesium oxide (MgO) and 7-35% by weight and zirconium oxide are those obtained by incorporating each (ZrO 2) in a proportion of 7-35 wt%, preferably content of magnesium oxide is 10 to 30% by weight and oxidation Zirconium is in the range of 10 to 30% by weight, and in another embodiment, as a refractory for a furnace wall, spinel (MgAl 2 O 4 ) is used instead of magnesium oxide in the refractory.
Is contained in the range of 30 to 60% by weight. In addition, in incinerators, melting furnaces, and the like using these refractories, the basicity of the usable (the material to be treated), which is preferable (can exhibit corrosion resistance), is in the range of 0.5 to 2. Is done.
【００１０】以下、上記範囲における組成で種々作成し
た耐火物と、上記範囲外の組成で種々作成した耐火物と
について、それぞれ耐食性を調べるための侵食実験を行
った結果を、下記の［表１］および［表２］に基づき説
明する。The results of erosion tests for investigating the corrosion resistance of refractories made variously with compositions in the above ranges and refractory variously made with compositions outside the above ranges are shown in Table 1 below. ] And [Table 2].
【００１１】まず、この侵食実験に使用した耐火物、す
なわち試料の作成方法およびその実験方法について説明
する。それぞれ平均粒径が５０μｍの酸化アルミニウ
ム、スピネル、酸化ジルコニウム、酸化マグネシウムお
よび酸化クロムをそれぞれ［表１］に示す割合で配合し
たものを、水を用いてボールミルにより２４時間混合
し、その後、乾燥機にて１２０℃でもって２４時間乾燥
した。なお、ボールミルで混合する際に、バインダーと
してＰＶＡ（ポリビニールアルコール）を粉末重量１０
０に対して３の割合で添加した。First, a method of preparing a refractory used in the erosion test, that is, a sample, and a test method thereof will be described. A mixture of aluminum oxide, spinel, zirconium oxide, magnesium oxide, and chromium oxide each having an average particle size of 50 μm at a ratio shown in Table 1 was mixed with water by a ball mill for 24 hours, and then dried. At 120 ° C. for 24 hours. When mixing with a ball mill, PVA (polyvinyl alcohol) was used as a binder with a powder weight of 10%.
It was added at a ratio of 3 to 0.
【００１２】この乾燥により得られた粉末を３００ｋｇ
／ｃｍ2の圧力でプレス成形を行い、その後、大気中に
て、１６００℃でもって２時間加熱して焼結を行い、７
０ｍｍ×７０ｍｍ×６５ｍｍの角柱状の試験片すなわち
試料を得た。[0012] 300 kg of the powder obtained by this drying
/ Cm 2 , and then sintering at 1600 ° C. for 2 hours in the air.
A rectangular test piece of 0 mm × 70 mm × 65 mm, that is, a sample was obtained.
【００１３】次に、実験方法であるが、上記各試料（試
験片）の中央部に、直径３０ｍｍ×深さ３５ｍｍの孔を
形成し、この孔に、下記の［表２］に示すような塩基度
が０．５、１．０および２．０に調整された３種類の侵
食剤を入れて、大気中にて、１４００℃でもって１００
時間加熱保持した。なお、侵食剤の塩基度を、０．５〜
２．０の範囲としたのは、通常、焼却灰の塩基度が０．
７〜１．０であることを考慮したものである。Next, as an experimental method, a hole having a diameter of 30 mm and a depth of 35 mm is formed in the center of each of the above-mentioned samples (test pieces), and this hole is formed as shown in Table 2 below. Three kinds of erosion agents whose basicity was adjusted to 0.5, 1.0 and 2.0 were put in the atmosphere at 1400 ° C. for 100 hours.
Heated and held for hours. In addition, the basicity of the erosion agent is 0.5 to
The range of 2.0 is usually used when the basicity of the incinerated ash is 0.1.
7 to 1.0.
【００１４】そして、加熱保持後、試料の中央部を切断
し、ＪＩＳ Ｒ２２１４にしたがって容損量および浸透
量をそれぞれ測定した。なお、［表１］中の評価につい
ては、Ａｌ2Ｏ3−３０％Ｃｒ2Ｏ3材における値を１とし
て、各試料を相対評価したものである。この評価は、○
と×とで表わしたが、Ａｌ2Ｏ3−３０％Ｃｒ2Ｏ3材の値
と同等若しくは優れていれば○、劣っていれば×とし
た。Then, after heating and holding, the central part of the sample was cut, and the impairment amount and the permeation amount were measured in accordance with JIS R2214. The evaluation in Table 1 is a relative evaluation of each sample, with the value of Al 2 O 3 -30% Cr 2 O 3 material being 1. This evaluation is ○
And x, the result was evaluated as ○ when the value was equal to or superior to the value of the Al 2 O 3 -30% Cr 2 O 3 material, and × when the value was inferior.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【表２】 [Table 2]
【００１７】［表１］の評価に基づき判断すると、酸化
マグネシウムの含有量が１０〜３０重量％で、かつ酸化
ジルコニウムの含有量が１０〜３０重量％の範囲である
場合（試料番号４，５，８，９，１５，１６，１９およ
び２０）に、それぞれ良好な結果が得られているのが分
かる。これに対して、酸化マグネシウムの含有量が４０
重量％である場合（試料番号６）、および酸化ジルコニ
ウムの含有量が４０重量％である場合（試料番号７）に
ついては、評価が不良であった。すなわち、試料番号６
に示すように、酸化マグネシウムが４０重量％以上にな
ると、スレーキング反応［ＭｇＯ＋Ｈ2Ｏ→Ｍｇ（Ｏ
Ｈ）2］を起こしてクラックが発生する。また、試料番
号７に示すように、酸化ジルコニウムが４０重量％以上
になると、熱スポーリング性が低下してクラックが発生
する。なお、試料番号３に示すように、酸化マグネシウ
ムおよび酸化ジルコニウムの含有量が共に５重量％であ
る場合では、評価は不良であった。Judging based on the evaluation in Table 1, the case where the content of magnesium oxide is in the range of 10 to 30% by weight and the content of zirconium oxide is in the range of 10 to 30% by weight (sample Nos. 4 and 5) , 8, 9, 15, 16, 19 and 20), it can be seen that good results were obtained. On the other hand, when the content of magnesium oxide is 40
The evaluation was poor in the case where the content was 5% by weight (Sample No. 6) and the case where the content of zirconium oxide was 40% by weight (Sample No. 7). That is, sample number 6
As shown in the figure, when the magnesium oxide content is 40% by weight or more, a slaking reaction [MgO + H 2 O → Mg (O
H) 2 ] and cracks occur. Further, as shown in Sample No. 7, when the content of zirconium oxide is 40% by weight or more, thermal spalling property is reduced and cracks occur. As shown in Sample No. 3, the evaluation was poor when both the contents of magnesium oxide and zirconium oxide were 5% by weight.
【００１８】さらに、上記耐火物において、酸化マグネ
シウムの替わりに、スピネルを３０〜６０重量％の割合
で含有させた場合（試料番号１０および１１）にも、上
述したように、酸化マグネシウムを含有させた場合と同
じ効果、すなわち耐食性が優れていることが分かる。但
し、試料番号１２に示すように、スピネルが７０重量％
以上になると、スピネルの分解により発生した酸化マグ
ネシウム（ＭｇＯ）がスレーキング反応を起こしてクラ
ックが発生する。Further, when spinel is contained in the refractory in a proportion of 30 to 60% by weight instead of magnesium oxide (sample Nos. 10 and 11), magnesium oxide is also contained as described above. It can be seen that the same effect as in the case of the above, that is, the corrosion resistance is excellent. However, as shown in Sample No. 12, the spinel content was 70% by weight.
In this case, magnesium oxide (MgO) generated by decomposition of the spinel causes a slaking reaction to cause cracks.
【００１９】なお、酸化クロムだけを添加した場合の結
果を、比較例として、試料番号１，２，１３，１４，１
７および１８に示しておく。これらの結果を勘案する
と、酸化アルミニウムに添加する（含有させる）酸化ク
ロム、酸化マグネシウムおよび酸化ジルコニウムの適正
な割合は、それぞれ５〜２０重量％、７〜３５重量％お
よび７〜３５重量％となり、また酸化マグネシウムの替
わりにスピネルを添加した場合には、その適正な添加割
合は、３０〜６０重量％の範囲となる。The results obtained when only chromium oxide was added were used as comparative examples as sample numbers 1, 2, 13, 14, 1 and 2.
7 and 18. Considering these results, the appropriate proportions of chromium oxide, magnesium oxide and zirconium oxide to be added (contained) to aluminum oxide are 5 to 20% by weight, 7 to 35% by weight and 7 to 35% by weight, respectively. When spinel is added instead of magnesium oxide, the proper addition ratio is in the range of 30 to 60% by weight.
【００２０】次に、上記各耐火物を組み込むのに適正な
炉としては、例えば焼却炉または焼却灰、産業廃棄物な
どを溶融して減容化するための溶融炉があり、特に、損
傷が激しいスラグライン近傍に使用（配置）することに
より、耐食性の効果が発揮される。勿論、スラグライン
近傍以外の部位に使用することもできる。Next, as a furnace suitable for incorporating each of the above refractories, for example, there is an incinerator or a melting furnace for melting incineration ash, industrial waste, and the like to reduce the volume thereof. By using (arranging) near a severe slag line, the effect of corrosion resistance is exhibited. Of course, it can also be used for parts other than the vicinity of the slag line.
【００２１】ここで、上記本発明品に係る耐火物を、実
際の溶融炉のスラグライン近傍に組み込んだ結果につい
て説明する。［表１］の試料番号８の組成のもの、すな
わち酸化マグネシウムを添加したものを用いて、４００
ｍｍ×４００ｍｍ×２００ｍｍのブロックを製作し、塩
基度が０．５である産業廃棄物の溶融炉に組み込み、２
００時間の連続運転を行った。Here, the result of incorporating the refractory according to the present invention into the vicinity of a slag line of an actual melting furnace will be described. Using the composition of Sample No. 8 in Table 1, that is, the composition to which magnesium oxide was added, 400
mm × 400 mm × 200 mm block was manufactured and incorporated in an industrial waste melting furnace with a basicity of 0.5.
The continuous operation for 00 hours was performed.
【００２２】そして、このブロックを取り出し、従来か
ら組み込まれている酸化クロムが３０重量％含有された
酸化アルミニウムを主成分とする耐火物と比較した。そ
の結果、従来の耐火物は１７ｍｍ容損したのに対し、本
発明品の耐火物の容損は１４ｍｍであり、従来の耐火物
に比べて、耐食性に優れていることが確認された。Then, the block was taken out and compared with a conventionally incorporated refractory mainly composed of aluminum oxide containing 30% by weight of chromium oxide. As a result, the conventional refractory lost 17 mm, whereas the refractory of the present invention lost 14 mm, and it was confirmed that the refractory was superior in corrosion resistance to the conventional refractory.
【００２３】このように、本発明に係る各耐火物は、酸
化クロムの含有量が５〜２０重量％と低くくても、酸化
クロムが３０〜５０重量％含有された耐火物と同等以上
の耐食性を有しており、したがって耐火物の使用時にお
ける六価クロムの発生を低くすることができる。As described above, each refractory according to the present invention has a chromium oxide content as low as 5 to 20% by weight, but is equal to or more than a refractory containing 30 to 50% by weight of chromium oxide. It has corrosion resistance, and thus can reduce the generation of hexavalent chromium when a refractory is used.
【００２４】また、本発明に係る耐火物を、溶融炉の炉
壁として使用した場合、その被溶融物の塩基度が０．５
〜２．０の範囲内であれば、耐食性が確実に得られる。
勿論、この耐火物は、溶融炉以外の炉、例えば焼却炉に
も適用することができる。When the refractory according to the present invention is used as a furnace wall of a melting furnace, the basicity of the material to be melted is 0.5%.
When it is in the range of 2.0 to 2.0, corrosion resistance can be reliably obtained.
Of course, this refractory can also be applied to furnaces other than melting furnaces, for example, incinerators.
【００２５】[0025]
【発明の効果】以上のように本発明の耐火物によると、
酸化クロムの含有量が５〜２０重量％と低くくても、そ
の含有量が３０〜５０重量％である耐火物と同等以上の
耐食性を発揮させることができ、したがって耐火物の使
用時に六価クロムの発生を低くすることができる。ま
た、この耐火物を溶融炉のスラグライン近傍に配置する
ことにより、耐食性に優れた溶融炉を提供することがで
きる。As described above, according to the refractory of the present invention,
Even if the content of chromium oxide is as low as 5 to 20% by weight, corrosion resistance equal to or higher than that of a refractory having a content of 30 to 50% by weight can be exhibited. The generation of chromium can be reduced. Further, by disposing the refractory near the slag line of the melting furnace, a melting furnace having excellent corrosion resistance can be provided.
Claims (3)
する炉壁用耐火物であって、酸化クロム（Ｃｒ2Ｏ3）の
含有量が５〜２０重量％、酸化マグネシウム（ＭｇＯ）
の含有量が７〜３５重量％および酸化ジルコニウム（Ｚ
ｒＯ2）の含有量が７〜３５重量％の範囲であることを
特徴とする炉壁用耐火物。1. A refractory for furnace walls containing aluminum oxide (Al 2 O 3 ) as a main component, wherein the content of chromium oxide (Cr 2 O 3 ) is 5 to 20% by weight and magnesium oxide (MgO)
Content of 7 to 35% by weight and zirconium oxide (Z
rO 2 ) content in the range of 7 to 35% by weight.
スピネル（ＭｇＡｌ2Ｏ4）を３０〜６０重量％の範囲で
含有させたことを特徴とする請求項１記載の炉壁用耐火
物。2. In place of magnesium oxide (MgO),
Spinel (MgAl 2 O 4) to claim 1 furnace wall refractory of wherein it contained in a range of 30 to 60 wt%.
炉本体の少なくともスラグライン近傍の内壁面に、請求
項１または２に記載の炉壁用耐火物を配置したことを特
徴とする溶融炉。3. A melting furnace for melting a material to be melted, wherein the refractory for a furnace wall according to claim 1 or 2 is arranged on at least an inner wall surface near a slag line of a furnace body in a melting furnace. Furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10003560A JPH11199317A (en) | 1998-01-12 | 1998-01-12 | Refractory for furnace wall and melting furnace using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10003560A JPH11199317A (en) | 1998-01-12 | 1998-01-12 | Refractory for furnace wall and melting furnace using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11199317A true JPH11199317A (en) | 1999-07-27 |
Family
ID=11560819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10003560A Pending JPH11199317A (en) | 1998-01-12 | 1998-01-12 | Refractory for furnace wall and melting furnace using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11199317A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005264186A (en) * | 2004-03-16 | 2005-09-29 | Jfe Steel Kk | Immersion lance coated with refractory and molten iron treating apparatus provided with this lance |
| JP2014084269A (en) * | 2012-10-26 | 2014-05-12 | Yotai Refractories Co Ltd | Castable refractory for nonferrous metal refining vessel and precast block using the same |
-
1998
- 1998-01-12 JP JP10003560A patent/JPH11199317A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005264186A (en) * | 2004-03-16 | 2005-09-29 | Jfe Steel Kk | Immersion lance coated with refractory and molten iron treating apparatus provided with this lance |
| JP4561135B2 (en) * | 2004-03-16 | 2010-10-13 | Ｊｆｅスチール株式会社 | Refractory-coated immersion lance and hot metal treatment apparatus including the same |
| JP2014084269A (en) * | 2012-10-26 | 2014-05-12 | Yotai Refractories Co Ltd | Castable refractory for nonferrous metal refining vessel and precast block using the same |
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